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Importance of Enharmonic Tone Spelling in Computational Analysis

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Importance of Enharmonic Tone Spelling in Computational Analysis Proceedings of the 7th Triennial Conference of European Society for the Cognitive Sciences of Music (ESCOM 2009) Jyväskylä, Finland Jukka Louhivuori, Tuomas Eerola, Suvi Saarikallio, Tommi Himberg, Päivi-Sisko Eerola (Editors) Importance of Enharmonic Tone Spelling in Computational Analysis of Tonal Structure Miroslaw Majchrzak (PhD student),*1 Bruno Gingras,#2 * Institute of Art, Polish Academy of Sciences in Warsaw, Poland #Department of Computing, Goldsmiths, University of London, United Kingdom [email protected], [email protected] ranges of a given key in a musical piece. The system enables ABSTRACT arranging a given set of keys in a hierarchical order under This paper will discuss various instances of enharmonic spellings of which chords have been classified. Thus, the chord C-E-G-Bb chords. Selected characteristic enharmonic chords in compositions of is always classified in key range -1 – F major and D minor the tonal period will be presented. The paper's main purpose is to (natural). If the B flat tone is enharmonically converted to A show: (1) the importance of the enharmonic spelling of chords/tones sharp (the chord being: C-E-G-A♯), the same chord will not be in the automated analysis of tonal music, (2) how the analysis of the assigned to the -1 key range, but instead, made part of a relative strength of a given key range is modified when we take into breakdown of non-diatonic chords. Our paper shows: account its enharmonic spellings, (3) the problem of enharmonic 1) The importance of the enharmonic spelling of spelling in characteristic chords (For example in the Tristan chord), (4) chords/tones in the automated analysis of tonal music, the interdependence between the enharmonic spelling in a given piece 2) How the analysis of the relative strength of a given key of music and the whole tonal structure (relationship between given range is modified a) when we distinguish enharmonic key ranges). spelling b) when we do not distinguish enharmonic spelling, I. INTRODUCTION 3) The problem of enharmonic spelling in characteristic chords (For example in the Tristan chord), Music scholars frequently use mathematics and 4) The interdependence between the enharmonic spelling computational methods to understand musical structure. in a given piece of music and the whole tonal structure However, researchers are often faced with various difficulties (relationship between given key ranges). during the analysis of a musical composition; e.g. regarding tone spelling (See for example: Olshki 1984). Problems related to the correct pitch spelling in the context of computational II. CLASSIFICATION AND tonality analysis have been discussed in various publications ENHARMONIC SPELLING OF CHORDS (for example: Winograd 1968, Meehan 1980, Mouton & Pachet 1995). In the analytical method introduced here, each of the key The correct pitch spelling is an important issue in the context ranges consist of set of diatonic chords. The algorithm can be of the analysis of tonality in a given musical piece. Carl described as: Schachter (1988) has written about a fragment of Chopin’s Arithmetic mean = x1, x2, x3, ..., xn /n Fantasy op. 49: “The orthography here is confusing but where: 1) x1, x2, x3, ..., xn – keys wherein the tones of a given chord appear, 2)n – total number of keys. (See for characteristic: the Cb really functions as a B♮, producing an augmented sixth above the bass’s Db, and resolving into the C example Majchrzak 2005, or 2007). major chord that begins the next section. There is, I think, a Many instances of interesting tone spellings can be found in significant association between this Cb (=B ) and the uses of Romantic music. For example, Chopin sometimes spelled the ♮ chord D-F sharp-A-C as D-G flat-A-C (Golab 1991). Cb/B , also members of augmented sixth chords, in the march ♮ Furthermore, editions can disagree regarding the spelling of ( ) 1 . The situation is more complicated in the late … ” specific notes. The following table lists all tones and keys. romanticism. The right spelling of tones is very significant in the context Table 1. Selected tones and keys of research on tonality. Chords such as F♯ , A♯, C♯ and Gb, Bb, Db are said to be enharmonic equivalents. Other notations of Tones Keys both chords can lead to other interpretations and musicological … … findings. This problem is especially conspicuous in G sharp 3, 4, 5, 6, 7, 8, 9 computational analyses of tonal structure, which often use the C sharp 2, 3, 4, 5, 6, 7, 8 MIDI format. To avoid this difficulty, numerous pitch spelling F sharp 1, 2, 3, 4, 5, 6, 7 B algorithms have been developed (For example: 0, 1, 2, 3, 4, 5, 6 … Cambouropoulos 2001, Meredith 2006). With the use of an … -2, 1, 0, 1, 2, 3, 4 analytical system (For example: Majchrzak 2007), we can A D -3, -2, 1, 0, 1, 2, 3 determine the quantitative dominance of chords classified by G -4, -3, -2, 1, 0, 1, 2 C -5, -4, -3, -2, 1, 0, 1 F -6, -5, -4, -3, -2, 1, 0 1 Schachter, pp. 233. URN:NBN:fi:jyu-2009411276 280 Proceedings of the 7th Triennial Conference of European Society for the Cognitive Sciences of Music (ESCOM 2009) Jyväskylä, Finland Jukka Louhivuori, Tuomas Eerola, Suvi Saarikallio, Tommi Himberg, Päivi-Sisko Eerola (Editors) … … A flat -9, -8, -7, -6, -5, -4, -3 D flat -10, -9, -8, -7, -6, -5, -4 Table 2. Analytical data 1 G flat -11, -10, -9, -8, -7, -6, -5 KR -8 -7 -6 -5 -4 -3 -2 -1 0 1 C flat -12, -11, -10, -9, -8, -7, -6 % 8 10 9 6 4 3 2 3 12 8 … … KR 2 3 4 5 6 7 8 N-D U/P % 4 2 1 5 7 4 1 7 4 Let us consider the classification of chord D-F#-A-C. Arithmetic mean = (-3, -2, -1, 0, 1, 2, 3)+(1, 2, 3, 4, 5, 6, 7)+ Chopin’s Etude in E flat minor possess a comparable tonal +(-2, -1, 0,1, 2, 3, 4)+(-5, -4, -3, -2, -1, 0, 1)/ 7+7+7+7 structure (See Majchrzak 2009). Let us have a look at the Arithmetic mean = 0.75 graphic relations between key ranges in our example (Table 2): 12 D-F#-A-C (0.75) 10 Value: 0 0.5 1 1.5 2 8 6 4 2 KRs2: C major G major D major A minor E minor B minor 0 -8-7-6-5-4-3-2-1012345678-N-DU/R Figure 1. Arithmetic mean and appropriate key range Figure 2. Graphical interpretation of the relationships between The arithmetic mean of this chord equals 0.75, and the chord given key ranges (Analytical data 1) is accordingly classified within key range 1 (G major/E minor)3, Let us assume that the main tonality of the piece is identified which seems very natural. As we have seen, D-F#-A-C is as G flat major. The above diagram is divided into the occasionally spelled as D-Gb-A-C. The arithmetic mean of this following material: chord equals -2,254. In this analysis, non-diatonic chords are - tonic key range classified within a separate column. However, we may classify - other key ranges this chord within a specific key range. This chord belongs to - non-diatonic chords; unison rests the key range B flat major/G minor. D-F#-A-C could also be Figure 2 suggests that this piece actually possesses several spelled as D-F#-A-B#, a German augmented sixth chord. In tonal centres, of which C flat major/A flat minor, G flat this case, the arithmetic mean of this chord equals 3.75, which major/E-flat minor, and C major/A minor appear to be the corresponds to E major/C# minor. While this chord does not most important. belong to the realm of E major, its C# minor functionality was exploited by several 19th-century composers. B. Summarizing the frequency of appearance of However, attempts to classify many non-diatonic chords corresponding key ranges within key ranges seem to be very unnatural. For instance, the Using the previous example, we can also summarize the augmented chord E-G#-C may act as altered tonic in E major, frequency of appearance of enharmonic equivalent key ranges C major, or A flat major (Ab-C-E). Hence, we cannot classify in the following way: non-diatonic chords in the key range. Table 3. Analytical data 2 KR -8 -7 -6 -5 -4 -3 III. DIAGRAM OF TONAL STRUCTURE KR 4 5 6 7 8 (9) % 9 15 16 10 5 3 A. Example of sophisticated relations between given key ranges KR -2 -1 0 1 2 3 KR (10) (11) (12) (13) (14) (15) Let us assume that a selected piece of music possesses the % 2 3 12 8 4 2 following tonal structure: 2 KR – abbreviation of key range. 3 The space between 1,5 and 2,5 belongs to the key range D major/B minor. 4 The space between -2,5 and -1,5 belongs to the key range Bb major/G minor URN:NBN:fi:jyu-2009411276 281 Proceedings of the 7th Triennial Conference of European Society for the Cognitive Sciences of Music (ESCOM 2009) Jyväskylä, Finland Jukka Louhivuori, Tuomas Eerola, Suvi Saarikallio, Tommi Himberg, Päivi-Sisko Eerola (Editors) 16 IV. SPECIFIC CHORDS AND THEIR 14 CLASSIFICATION 12 Numerous characteristic chords are encountered in music. 10 For example, the Tristan chord is a chord consisting of the 8 notes F, B, D♯ , G♯. The same chord can be interpreted as a 6 suspended altered subdominant II (B, D♯, F, Ab) or as a 4 half-diminished chord (F, Ab, Cb, Eb).
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